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Information for the Flexible Pedestrian Legform Impactor (Flex-PLI)

Informal Document No. GRSP-36-2 (36th GRSP, 7-10 December 2004, agenda item A.1.). Information for the Flexible Pedestrian Legform Impactor (Flex-PLI). Ministry of Land, Infrastructure and Transport Government of Japan (J-MLIT). Construction. Biofidelity Evaluation. TRL-LFI.

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Information for the Flexible Pedestrian Legform Impactor (Flex-PLI)

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  1. Informal Document No. GRSP-36-2 (36th GRSP, 7-10 December 2004, agenda item A.1.) Information for the Flexible Pedestrian Legform Impactor (Flex-PLI) Ministry of Land, Infrastructure and Transport Government of Japan (J-MLIT)

  2. Construction Biofidelity Evaluation TRL-LFI Flex-PLI 2003 Thigh (RIGID) Thigh (FLEXIBLE) Damper Knee Joint* (ligament restraint system) Knee Joint (Steel Knee Bending Plate) Leg (RIGID) Leg (FLEXIBLE) Flex-PLI has higher biofidelic construction than the TRL-LFI

  3. Kinematics Flex-PLI can simulate human lower extremity bending motion properly. FE-Model of TRL-LFI TRL-LFI Knee bending only Human FE-Model (THUMS) Flex-PLI JASIC 2003 Report Over all lower extremity bending motion is observed.

  4. Measurement System TRL-LFI Flex-PLI 2003 332 mm Thigh 4 (strain) for Knee ligaments injury assessment (Angle, Disp.) 252 mm Thigh 3 (strain) 172 mm Thigh 2 (strain) for Knee ligaments injury assessment (Elongation) 92 mm Knee Shearing Thigh 1 (strain) (displacement) ACL (elongation) PCL (elongation) Knee Bending Impact (angle) MCL (elongation) Knee Joint Knee Joint Impact LCL (elongation) 65 mm Lateral and Medial Condyle (force) Leg 0 (acceleration) Leg 1 (strain) 93 mm for Leg injury assessment (Acc.) Leg 2 (strain) 173 mm Leg 3(strain) 253 mm Leg 4(strain) 333 mm Leg 5 (strain) 413 mm for Leg Injury assessment (strain) no measurement (cannot detect injury) Flex-PLI has higher injury assessment ability than the TRL-LFI

  5. Discussion

  6. Biofidelity Issue TRL-LFI has a high possibility to mislead the protection way for the pedestrian lower extremity, since it cannot simulate the human lower extremity motion properly. TRL-LFI Knee bending only Flex-PLI Over all lower extremity bending motion is observed.

  7. TRL-LFI for Knee ligaments injury assessment (Angle, Disp.) Knee Shearing (displacement) Knee Bending (angle) Knee Joint Impact 65 mm Leg 0 (acceleration) for Leg injury assessment (Acc.) Measurement System Issue TRL-LFI has a high possibility to mislead the protection way for the pedestrian lower extremity, since it doesn’t have a measurement system for the injury assessment of the lower part of the leg. no measurement (cannot detect injury) TRL-LF cannot detect the lower part of the leg severity

  8. Conclusions

  9. Conclusions • Flex-PLI has • high biofidelity • higher injury assessment ability than the TRL-LFI • J-MLIT recommends to utilize the Flex-PLI as a tool for GTR/PS legform test. • However, because of the lack of experience in using the Flex-PLI as a certification tool, a further confirmation process is needed.

  10. Thank you for your attention!

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